Express the induced emf as scalar triple product of `vecv, vecB and vecl`.

Explanation

To express the induced electromotive force (emf) as a scalar triple product of the vectors \(\vec{v}\), \(\vec{B}\), and \(\vec{l}\), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Induced EMF**: The induced emf (\(E\)) in a circuit can be defined using the equation:
\[ dV = -\vec{E} \cdot d\vec{r} \]
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